1889956820 has 18 divisors (see below), whose sum is σ = 3969317646. Its totient is φ = 755904960.

The previous prime is 1889956813. The next prime is 1889956841. The reversal of 1889956820 is 286599881.

It can be written as a sum of positive squares in 3 ways, for example, as 171191056 + 1718765764 = 13084^2 + 41458^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 189560 + ... + 199280.

It is an arithmetic number, because the mean of its divisors is an integer number (220517647).

Almost surely, 2^1889956820 is an apocalyptic number.

1889956820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1889956820 is an abundant number, since it is smaller than the sum of its proper divisors (2079360826).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1889956820 is an frugal number, since it uses more digits than its factorization.

1889956820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19451 (or 9728 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 56.

The square root of 1889956820 is about 43473.6336185509. The cubic root of 1889956820 is about 1236.3761741513.

The spelling of 1889956820 in words is "one billion, eight hundred eighty-nine million, nine hundred fifty-six thousand, eight hundred twenty".